前言
使用STM32CUBE生成LL库进行模拟IIC驱动OLED
一、OLED模块接口定义
- GND 电源地
- VCC 电源正(3~5.5V)
- SCL OLED 的 D0 脚,在 IIC 通信中为时钟管脚
- SDA OLED 的 D1 脚,在 IIC 通信中为数据管脚
二、使用步骤
1.驱动
例程使用模拟IIC来驱动OLED,注意时钟频率(不大于400MHz)
OLED.H代码如下(示例):
#ifndef __OLED_H
#define __OLED_H
#include "main.h"
#include "gpio.h"
#include "stm32f1xx_ll_system.h"
#include "stdlib.h"
#define OLED_MODE 0
#define SIZE 8
#define XLevelL 0x00
#define XLevelH 0x10
#define Max_Column 128
#define Max_Row 64
#define Brightness 0xFF
#define X_WIDTH 128
#define Y_WIDTH 64
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
#define OLED_SCLK_Clr() LL_GPIO_ResetOutputPin(GPIOB, LL_GPIO_PIN_6)
#define OLED_SCLK_Set() LL_GPIO_SetOutputPin(GPIOB, LL_GPIO_PIN_6)
#define OLED_SDIN_Clr() LL_GPIO_ResetOutputPin(GPIOB, LL_GPIO_PIN_7)
#define OLED_SDIN_Set() LL_GPIO_SetOutputPin(GPIOB, LL_GPIO_PIN_7)
#define OLED_CMD 0
#define OLED_DATA 1
void OLED_WR_Byte(unsigned dat,unsigned cmd);
void OLED_Display_On(void);
void OLED_Display_Off(void);
void OLED_Init(void);
void OLED_Clear(void);
void OLED_DrawPoint(u8 x,u8 y,u8 t);
void OLED_Fill(u8 x1,u8 y1,u8 x2,u8 y2,u8 dot);
void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 Char_Size);
void OLED_ShowNum(u8 x,u8 y,float num,u8 z_len,u8 f_len,u8 size2);
void OLED_ShowNumZ(u8 x,u8 y,u32 num,u8 len,u8 size);
void OLED_ShowString(u8 x,u8 y, u8 *p,u8 Char_Size);
void OLED_Set_Pos(unsigned char x, unsigned char y);
void OLED_ShowCHinese(u8 x,u8 y,u8 no);
void OLED_DrawBMP(unsigned char x0, unsigned char y0,unsigned char x1, unsigned char y1,unsigned char BMP[]);
void Delay_50ms(unsigned int Del_50ms);
void Delay_1ms(unsigned int Del_1ms);
void fill_picture(unsigned char fill_Data);
void Picture();
void IIC_Start();
void IIC_Stop();
void Write_IIC_Command(unsigned char IIC_Command);
void Write_IIC_Data(unsigned char IIC_Data);
void Write_IIC_Byte(unsigned char IIC_Byte);
void IIC_Wait_Ack();
#endif
OLED.C代码如下(示例):
#include "oled.h"
#include "stdlib.h"
#include "oledfont.h"
void IIC_Delay()
{
for(int i=0;i<5;i++);
}
void IIC_Start()
{
OLED_SCLK_Set();
OLED_SDIN_Set();
IIC_Delay();
OLED_SDIN_Clr();
OLED_SCLK_Clr();
IIC_Delay();
}
void IIC_Stop()
{
OLED_SCLK_Set() ;
IIC_Delay();
OLED_SDIN_Clr();
OLED_SDIN_Set();
IIC_Delay();
}
void IIC_Wait_Ack()
{
OLED_SCLK_Set() ;
OLED_SCLK_Clr();
IIC_Delay();
}
void Write_IIC_Byte(unsigned char IIC_Byte)
{
unsigned char i;
unsigned char m,da;
da=IIC_Byte;
OLED_SCLK_Clr();
for(i=0;i<8;i++)
{
m=da;
m=m&0x80;
if(m==0x80)
{OLED_SDIN_Set();}
else OLED_SDIN_Clr();
da=da<<1;
OLED_SCLK_Set();
IIC_Delay();
OLED_SCLK_Clr();
IIC_Delay();
}
}
void Write_IIC_Command(unsigned char IIC_Command)
{
IIC_Start();
Write_IIC_Byte(0x78);
IIC_Wait_Ack();
Write_IIC_Byte(0x00);
IIC_Wait_Ack();
Write_IIC_Byte(IIC_Command);
IIC_Wait_Ack();
IIC_Stop();
}
void Write_IIC_Data(unsigned char IIC_Data)
{
IIC_Start();
Write_IIC_Byte(0x78);
IIC_Wait_Ack();
Write_IIC_Byte(0x40);
IIC_Wait_Ack();
Write_IIC_Byte(IIC_Data);
IIC_Wait_Ack();
IIC_Stop();
}
void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
if(cmd)
{
Write_IIC_Data(dat);
}
else {
Write_IIC_Command(dat);
}
}
void fill_picture(unsigned char fill_Data)
{
unsigned char m,n;
for(m=0;m<8;m++)
{
OLED_WR_Byte(0xb0+m,0);
OLED_WR_Byte(0x00,0);
OLED_WR_Byte(0x10,0);
for(n=0;n<128;n++)
{
OLED_WR_Byte(fill_Data,1);
}
}
}
void Delay_50ms(unsigned int Del_50ms)
{
unsigned int m;
for(;Del_50ms>0;Del_50ms--)
for(m=6245;m>0;m--);
}
void Delay_1ms(unsigned int Del_1ms)
{
unsigned char j;
while(Del_1ms--)
{
for(j=0;j<123;j++);
}
}
void OLED_Set_Pos(unsigned char x, unsigned char y)
{ OLED_WR_Byte(0xb0+y,OLED_CMD);
OLED_WR_Byte(((x&0xf0)>>4)|0x10,OLED_CMD);
OLED_WR_Byte((x&0x0f),OLED_CMD);
}
void OLED_Display_On(void)
{
OLED_WR_Byte(0X8D,OLED_CMD);
OLED_WR_Byte(0X14,OLED_CMD);
OLED_WR_Byte(0XAF,OLED_CMD);
}
void OLED_Display_Off(void)
{
OLED_WR_Byte(0X8D,OLED_CMD);
OLED_WR_Byte(0X10,OLED_CMD);
OLED_WR_Byte(0XAE,OLED_CMD);
}
void OLED_Clear(void)
{
u8 i,n;
for(i=0;i<8;i++)
{
OLED_WR_Byte (0xb0+i,OLED_CMD);
OLED_WR_Byte (0x00,OLED_CMD);
OLED_WR_Byte (0x10,OLED_CMD);
for(n=0;n<128;n++)OLED_WR_Byte(0,OLED_DATA);
}
}
void OLED_On(void)
{
u8 i,n;
for(i=0;i<8;i++)
{
OLED_WR_Byte (0xb0+i,OLED_CMD);
OLED_WR_Byte (0x00,OLED_CMD);
OLED_WR_Byte (0x10,OLED_CMD);
for(n=0;n<128;n++)OLED_WR_Byte(1,OLED_DATA);
}
}
void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 Char_Size)
{
unsigned char c=0,i=0;
c=chr-' ';
if(x>Max_Column-1){x=0;y=y+2;}
if(Char_Size ==16)
{
OLED_Set_Pos(x,y);
for(i=0;i<8;i++)
OLED_WR_Byte(F8X16[c*16+i],OLED_DATA);
OLED_Set_Pos(x,y+1);
for(i=0;i<8;i++)
OLED_WR_Byte(F8X16[c*16+i+8],OLED_DATA);
}
else {
OLED_Set_Pos(x,y);
for(i=0;i<6;i++)
OLED_WR_Byte(F6x8[c][i],OLED_DATA);
}
}
u32 oled_pow(u8 m,u8 n)
{
u32 result=1;
while(n--)result*=m;
return result;
}
void OLED_ShowNumZ(u8 x,u8 y,u32 num,u8 len,u8 size)
{
u8 t,temp;
u8 enshow=0;
for(t=0;t<len;t++)
{
temp=(num/oled_pow(10,len-t-1))%10;
if(enshow==0&&t<(len-1))
{
if(temp==0)
{
OLED_ShowChar(x+(size/2)*t,y,' ',size);
continue;
}else enshow=1;
}
OLED_ShowChar(x+(size/2)*t,y,temp+'0',size);
}
}
void OLED_ShowNum(u8 x,u8 y,float num,u8 z_len,u8 f_len,u8 size2)
{
u8 t,temp;
u8 enshow=0;
int z_temp,f_temp;
z_temp=(int)num;
for(t=0;t<z_len;t++)
{
temp=(z_temp/oled_pow(10,z_len-t-1))%10;
if(enshow==0 && t<(z_len-1))
{
if(temp==0)
{
OLED_ShowChar(x+(size2/2)*t,y,' ',size2);
continue;
}
else
enshow=1;
}
OLED_ShowChar(x+(size2/2)*t,y,temp+'0',size2);
}
OLED_ShowChar(x+(size2/2)*(z_len),y,'.',size2);
f_temp=(int)((num-z_temp)*(oled_pow(10,f_len)));
for(t=0;t<f_len;t++)
{
temp=(f_temp/oled_pow(10,f_len-t-1))%10;
OLED_ShowChar(x+(size2/2)*(t+z_len)+5,y,temp+'0',size2);
}
}
void OLED_ShowString(u8 x,u8 y,u8 *chr,u8 Char_Size)
{
unsigned char j=0;
while (chr[j]!='\0')
{ OLED_ShowChar(x,y,chr[j],Char_Size);
x+=8;
if(x>120){x=0;y+=2;}
j++;
}
}
void OLED_ShowCHinese(u8 x,u8 y,u8 no)
{
u8 t,adder=0;
OLED_Set_Pos(x,y);
for(t=0;t<16;t++)
{
OLED_WR_Byte(Hzk[2*no][t],OLED_DATA);
adder+=1;
}
OLED_Set_Pos(x,y+1);
for(t=0;t<16;t++)
{
OLED_WR_Byte(Hzk[2*no+1][t],OLED_DATA);
adder+=1;
}
}
void OLED_DrawBMP(unsigned char x0, unsigned char y0,unsigned char x1, unsigned char y1,unsigned char BMP[])
{
unsigned int j=0;
unsigned char x,y;
if(y1%8==0) y=y1/8;
else y=y1/8+1;
for(y=y0;y<y1;y++)
{
OLED_Set_Pos(x0,y);
for(x=x0;x<x1;x++)
{
OLED_WR_Byte(BMP[j++],OLED_DATA);
}
}
}
void OLED_Init(void)
{
OLED_WR_Byte(0xAE,OLED_CMD);
OLED_WR_Byte(0x00,OLED_CMD);
OLED_WR_Byte(0x10,OLED_CMD);
OLED_WR_Byte(0x40,OLED_CMD);
OLED_WR_Byte(0xB0,OLED_CMD);
OLED_WR_Byte(0x81,OLED_CMD);
OLED_WR_Byte(0xFF,OLED_CMD);
OLED_WR_Byte(0xA1,OLED_CMD);
OLED_WR_Byte(0xA6,OLED_CMD);
OLED_WR_Byte(0xA8,OLED_CMD);
OLED_WR_Byte(0x3F,OLED_CMD);
OLED_WR_Byte(0xC8,OLED_CMD);
OLED_WR_Byte(0xD3,OLED_CMD);
OLED_WR_Byte(0x00,OLED_CMD);
OLED_WR_Byte(0xD5,OLED_CMD);
OLED_WR_Byte(0x80,OLED_CMD);
OLED_WR_Byte(0xD8,OLED_CMD);
OLED_WR_Byte(0x05,OLED_CMD);
OLED_WR_Byte(0xD9,OLED_CMD);
OLED_WR_Byte(0xF1,OLED_CMD);
OLED_WR_Byte(0xDA,OLED_CMD);
OLED_WR_Byte(0x12,OLED_CMD);
OLED_WR_Byte(0xDB,OLED_CMD);
OLED_WR_Byte(0x30,OLED_CMD);
OLED_WR_Byte(0x8D,OLED_CMD);
OLED_WR_Byte(0x14,OLED_CMD);
OLED_WR_Byte(0xAF,OLED_CMD);
}
总结
错误出现较多的地方就是延时函数的设置,时钟频率过高导致OLED无显示或者乱码,需要一步一步调试
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